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Researchers report that SiC derived from ag waste can function as Li-ion anodes; competitive with silicon

Researchers at the University of Michigan, with colleagues from Michigan State University and Karlsruhe Institute of Technology (KIT) in Germany, report that high surface area silicon carbide (SiC) w/wo 13 wt. % hard carbon (SiC/HC, SiC/O), derived from the carbothermal reduction of silica-depleted rice hull ash (SDRHA), can function as Li+ battery anodes that are potentially competitive with silicon anodes.

In an open-access paper in the RSC journal Green Chemistry, the team reports that galvanostatic cycling of SiC/HC and SiC/O shows capacity increases eventually to > 950 mAh g-1 (Li1.2-1.4SiC) and > 740 mAh g-1 (Li1.1SiC), respectively, after 600 cycles.

SEMs show cycled electrodes maintain their integrity, implying almost no volume expansion on lithiation/delithiation, contrasting with > 300 % volume changes in Si anodes on lithiation. Significant void space is needed to compensate for these volume changes in contrast to SiC anodes suggesting nearly competitive capacities. 6Li MAS NMR and XPS show no evidence of LixSi, with Li preferring all-C environments supported by computational modeling. Modeling also supports deviation from the 3C phase at high Li contents with minimal volume changes.

—Yu et al.

Rice hull ash (RHA), a byproduct of rice hull combustion for fuel value, consists typically of 80-90 wt. % amorphous SiO2 intimately mixed with unburned hard carbon (HC) at the nanoscale. RHA is considered an agricultural waste.

The researchers had earlier described a method of directly extracting SiO2 from RHA to produce silica-depleted RHA (SDRHA) using an environmentally- and economically-friendly approach.

Mercedes-Benz Research & Development North America (MBRDNA) contributed funding to this work.

Resources

  • Mengjie Yu, Eleni Temeche, Sylvio Indris, Wei Lai and Richard M Laine (2022) “Silicon Carbide (SiC) Derived from Agricultural Waste Potentially Competitive with Silicon Anodes” Green Chemistry doi: 10.1039/D2GC00645F

Comments

RobertMiller

Glad to read this post.

Gryf

“Mercedes-Benz Research & Development North America (MBRDNA) contributed funding to this work.”

Mercedes looks like it is investing in Lithium Silicon batteries. The Vision EQXX appears to rely on this technology, possibly using the Farasis battery (Re: https://www.bloomberg.com/news/articles/2021-10-07/mercedes-backed-farasis-says-silicon-boosts-battery-energy-25).
Group 14 Technology developed the Silicon Carbide Anode for Farasis. This technology is also cheaper than Graphite Anodes currently in use in most Lithium Ion batteries. It can also use local sourced material as shown in this research and in this Group 14 white paper (https://group14.technology/en/whitepapers/whitepaper-lithium-silicon-batteries-at-global-scale).

SJC

after 600 cycles
implying almost no volume expansion on lithiation / delithiation
Sounds promising

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